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Spatially-resolved luminescence and crystal structure of single core-shell nanowires measured in the as-grown geometry

机译：在以生长几何体测量的单芯壳纳米线的空间分辨发光和晶体结构

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摘要

We report on the direct correlation between the structural and optical properties of single, as-grown core-multi-shell GaAs/In0.15Ga0.85As/GaAs/AlAs/GaAs nanowires. Fabricated by molecular beam epitaxy on a pre-patterned Si(111) substrate, on a row of well separated nucleation sites, it was possible to access individual nanowires in the as-grown geometry. The polytype distribution along the growth axis of the nanowires was revealed by synchrotron-based nanoprobe x-ray diffraction techniques monitoring the axial 111 Bragg reflection. For the same nanowires, the spatially-resolved emission properties were obtained by cathodoluminescence hyperspectral linescans in a scanning electron microscope. Correlating both measurements, we reveal a blueshift of the shell quantum well emission energy combined with an increased emission intensity for segments exhibiting a mixed structure of alternating wurtzite and zincblende stacking compared with the pure crystal polytypes. The presence of this mixed structure was independently confirmed by cross-sectional transmission electron microscopy.
机译：我们报告了单，生长核心多壳GAAs / IN0.15GA0.85AS / GAAS / ALAS / GAAS纳米线的结构和光学性质之间的直接相关性。在预定的Si（111）衬底上的分子束外延在一排井分离的核心位点上制造，可以在生长的几何形状中进入各个纳米线。沿纳米线的生长轴的聚贸易分布通过基于同步的纳米孔X射线衍射技术揭示监测轴向111布拉格反射。对于相同的纳米线，通过在扫描电子显微镜中通过阴极致发光高光谱线路获得空间分辨的发射性能。与纯晶体多型相比，展示壳量子阱发射能量的平坦发射能量的平坦发射强度的增加，露出壳量子阱排放能量增加，该壳体井发射能量增加，所述发射强度增加了交替湿度叠层和Zincblende堆叠的混合结构。通过横截面透射电子显微镜独立地确认这种混合结构的存在。

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